Korsu 355 is a military bunker located in Finland, near the coastal region of the Gulf of Finland. This structure is part of Finland's extensive network of defensive fortifications built during the Cold War era, reflecting the country's strategic position between NATO and the Soviet Union. The bunker exemplifies the typical Finnish military architecture of the period, designed to withstand potential conflicts while maintaining Finland's policy of neutrality.
The bunker's location in the southwestern part of Finland places it in a region with significant military infrastructure, including the nearby Olkiluoto nuclear power plant. This area has been of strategic importance for both civilian energy production and military defense planning. The structure likely served as part of Finland's comprehensive defense system, which included numerous bunkers and fortifications designed to protect key installations and population centers.